Description 30pcs USB Tester Current Voltage Charger Capacity Tester Volt Current Voltage Meter Mobile Power Detector Battery Test Wholesale Features: 100% Brand New and High Quality This is the mini USB meter. It can measure voltage, current, power and capacity It can clearly display all the data Can easily measure the USB ( PC USB, cell phone charger, car charger , mobile power , etc. ) port and device operating current and the output voltage charge-discharge capacity,performance, and judge the performance of the charging cable charging equipment, this tester can meet the requirements Fit to factories, laboratories and personal use, wide range and Easy to use, easy to take alone, no additional power supply, Plug and play. Specifications: Material: Plastic Color: Black Voltage: 3-9V+/-1% Current: 0-3A+/-1% Time: 0-99H Net weight: 19g Packing Includes: 30 x Current Voltage Capacity Tester NOTE: This item come without retail package and it will have KEWEISI on that usb Brand:keweisi (this product brand is KEWEISI,not JUANJUAN,please kindly note it )